Looking for a good high-pass or pass band audio filter

Discussion in 'General Electronics Chat' started by arenwi, Apr 20, 2016.

  1. arenwi

    Thread Starter Member

    Dec 29, 2014
    37
    0
    Hello to every body,

    I´m trying to make audio measurements with a microphone on a noise machine. After I will analize it with a dsp.

    I´m having problems with some noise in low frecuencies.

    I would like to find an active high pas filter integrate with tuenable frecuenci fc 200hz for example but with a good order on the filter (like 4 or 8). If it is a band pass filter for audio is also ok.

    Many thaks for your help

    Aren from Spain
     
  2. arenwi

    Thread Starter Member

    Dec 29, 2014
    37
    0
    Please any help
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,000
    3,229
    Tunable high order filters are not simple.
    Have a look at this article.
     
  4. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,523
    1,247
    Are you looking for a circuit to build, or a piece of equipment to buy?

    ak
     
  5. Veracohr

    Well-Known Member

    Jan 3, 2011
    550
    75
    Why does the noise need to be filtered before converting to digital? Is is that much larger than the signal? Does it really need to be tuneable?

    What frequency is the noise and what is the frequency range of interest?
     
  6. recklessrog

    Member

    May 23, 2013
    338
    102
    Why not use an audio graphic equaliser, that way you can cut the frequencies you don't want, and boost the one you need.
     
  7. arenwi

    Thread Starter Member

    Dec 29, 2014
    37
    0
    Hi every body, MAny thanks for your effort.

    I´m looking for a single component to make a hight pass filter arround 200Hz. It didn´t need to be tuneable.

    The Idea is to take only the measurement of frecuencies biguer that 200 HZ. I was making test with some circuits with order 2 of atenuation (12dB/oct) but I need something more like order 4 with 24dB of atenuation or more. I would like to buy a simple IC and make it with some resistors and capacitor on this IC. I would´nt like to make a log schematic for this use.

    Best regards and many thanks

    Aren
     
  8. recklessrog

    Member

    May 23, 2013
    338
    102
    google "rumble filter" as used on audio amplifiers to cut the low Hz when using turntables and vinyl records
     
  9. Marley

    Member

    Apr 4, 2016
    142
    40
    OK. Simple high-pass filter. Two capacitors and two resistors. Only guessing the values here! There is nothing very good about it - but it is simple!
     
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